Laser duration to be effective

I’m trying to make set up a laser to activate and deactivate in as short of a time as possible while still reliably dealing damage. This is so I can use it to mimic a projectile being shot, like an arrow or something like that. What is the shortest amount of time a laser has to be on to deliver damage?

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Help, please.
I believe that any time would work.

trigger loop (delay: 0.01)>>>>laser deactivate (and other trigger activate)

Da Arrow OF DOOOOOOM
for the arrow.

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Moved topic over to Help since it’s a question.